Sharpener-Fire Starter-Bottle Opener The Mini Sharp-N-Spark sharpener also features a magnesium fire starter stowed into handle plus a bottle opener built right in. That, and the World’s best knife sharpener on the side! It comes in red and black for easy locating if dropped. The magnesium fire starter last a lifetime and makes for a great survival tool. Sharp-N-Spark is the best All-In-One tool on the market.